While a 3,100-word mission statement published last week by Satya Nadella consisted mostly of amorphous ramblings about the future of Microsoft, it turns out the tech exec may have buried a rather ominous lede.

Microsoft is reportedly eyeing what may be its most massive round of layoffs ever. The announcement, which could arrive as soon as this week, comes as the tech giant seeks to integrate roughly 30,000 new employees on the heels of its Nokia acquisition, Bloombergreports.

While Nadella did hint at “organization changes” in his letter to employees, cuts “will probably be in engineering, marketing and areas of overlap with Nokia,” sources said. Affected departments could include members of the global Xbox marketing team as well as software testers.